How to install Ratchet and how to use it?

Question

I opened the documentation on socketo.me. I clicked and clicked somewhere, and somehow the folder cboden \ ratchet appeared. OK.

I look further:

"autoload": { "psr-0": { "MyApp": "src" } },

What is this? What kind of psr-0? What kind of strange names they give? What is src?

 namespace MyApp; use Ratchet\MessageComponentInterface; use Ratchet\ConnectionInterface;

This code is highlighted in red. I do not understand where he should take it from.

 require dirname(__DIR__) . '/vendor/autoload.php';

And what is this? What kind of autoload? What kind of vendor?

How to work with it? Explain somebody on your fingers.

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